If you are indeed pregnant, sooner or later a pregnancy test will come up positive. Wait one more week, if you still do not have your period than take another test. Usually, over-the-counter tests require specific amounts of the HCG hormone, which is the hormone detected when you are indeed pregnant. It usually take approx. two weeks after conception for this hormone to be detected in your urine. Your pains could be from a number of different things. Not nesecarily pregnancy. Additionally, it usually takes around 4 weeks for a woman to start having obvious signs, like morning sickness, being very tired, headaches, etc., from the time of conception. If after one more week, you still have no period and your pregnancy test comes up negative, you may not have ovulated. In this case it is very possible that you are just going to "skip" a period. But, if you are the type that has a period on time each and every month and you have had unprotected s_x, there is a good chance you are expecting. Otherwise, it may be a good idea to see your doctor and get a definite answer to why you have no period with negative preg. tests. Good luck and hang in there.